Brine isn't any better for your car:
http://www.getsurrey.co.uk/news/loca...hnique-4826238
http://www.boston.com/business/gallery/brinesolution/
23% salinity is not good news for your car, and it more readily sticks to metal since it's liquid. Not to mention when roads are wet, you're catching salt mist on everything from cars ahead of you.
What I typically do when I know they've brined the roads to prevent black ice (a frequent problem with rain freezing overnight) is I take my car to a touch free car wash with an underbody wash. They're not hard to find.
Also, the freeways are rough here because of high traffic volume, and there's more road debris than any other state I've been to. You'll take a LOT of rock chips on your windshield and paint year round because the rain makes loose gravel stick to the roads (which also accelerates road wear and breaks loose more gravel), and thousands of trucks like to go mudding and wear it as a badge of honor, fucking over every other driver behind them. Luckily I learned this in a used car before I bought 2 new ones and got venture shield. I would highly recommend that and opticoat. Also, avoid traveling too close behind trucks, SUVs, and semis.
And to echo everyone else, I've never bottomed out on Seattle and Tacoma's steepest streets.